ST10F271Z1Q3 datasheet(61/185 Pages) STMICROELECTRONICS

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ST10F271Z1

PWM modules

61/185

PWM modules

Two pulse width modulation modules are available on ST10F271Z1: standard PWM0 and

XBus PWM1. They can generate up to four PWM output signals each, using edge-aligned or

centre-aligned PWM. In addition, the PWM modules can generate PWM burst signals and

single shot outputs. The Table 38 and Table 39 show the PWM frequencies for different

resolutions. The level of the output signals is selectable and the PWM modules can

generate interrupt requests.

Figure 12.

Block diagram of PWM module

Table 38.

PWM unit frequencies and resolutions at 40 MHz CPU clock

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

25 ns

156.25 kHz

39.1 kHz

9.77 kHz

2.44 Hz

610 Hz

CPU

clock/64

1.6

µs

2.44 kHz

610 Hz

152.6 Hz

38.15 Hz

9.54 Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

25 ns

78.12 kHz

19.53 kHz

4.88 kHz

1.22 kHz

305.2 Hz

CPU

clock/64

1.6

µs

1.22 kHz

305.17 Hz

76.29 Hz

19.07 Hz

4.77 Hz

Table 39.

PWM unit frequencies and resolutions at 64 MHz CPU clock

Mode 0

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

15.6 ns

250 kHz

62.5 kHz

15.63 kHz

3.91 Hz

977 Hz

CPU

clock/64

1.0

µs

3.91 kHz

976.6 Hz

244.1 Hz

61.01 Hz

15.26 Hz

Mode 1

Resolution

8-bit

10-bit

12-bit

14-bit

16-bit

CPU clock/1

15.6 ns

125 kHz

31.25 kHz

7.81 kHz

1.95 kHz

488.3 Hz

CPU

clock/64

1.0

µs

1.95 kHz

488.28 Hz

122.07 Hz

30.52 Hz

7.63 Hz

PPx Period Register

Comparator

PTx

16-bit Up/Down Counter

Shadow Register

PWx Pulse Width Register

Input

Run

Control

Clock 1

Clock 2

Comparator

Up/Down/

Clear Control

Match

Output Control

Match

Write Control

* User readable / writeable register

Enable

POUTx

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